Air filter



FIG. 1 is a front perspective view of an air filter showing our newdesign;

FIG. 2 is a bottom view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof.

The uneven-length broken lines immediately adjacent to the shaded areadefine the bounds of the claimed design and form no part of the claimeddesign. The broken lines depicting the remainder of the air filter formno part of the claimed design.

CLAIM The ornamental design for an air filter, as shown and described.